package com.nageoffer.shortlink.admin.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.lang.UUID;
import com.alibaba.fastjson2.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.nageoffer.shortlink.admin.common.convention.exception.ClientException;
import com.nageoffer.shortlink.admin.common.enums.UserErrorCodeEnum;
import com.nageoffer.shortlink.admin.dao.entity.UserDO;
import com.nageoffer.shortlink.admin.dao.mapper.UserMapper;
import com.nageoffer.shortlink.admin.dto.req.UserLoginReqDTO;
import com.nageoffer.shortlink.admin.dto.req.UserRegisterReqDTO;
import com.nageoffer.shortlink.admin.dto.req.UserUpdateReqDTO;
import com.nageoffer.shortlink.admin.dto.resp.UserLoginRespDTO;
import com.nageoffer.shortlink.admin.dto.resp.UserRespDTO;
import com.nageoffer.shortlink.admin.service.GroupService;
import com.nageoffer.shortlink.admin.service.UserService;
import lombok.RequiredArgsConstructor;
import org.redisson.api.RBloomFilter;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.BeanUtils;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.nageoffer.shortlink.admin.common.constant.RedisCacheConstant.LOCK_USER_REGISTER_KEY;
import static com.nageoffer.shortlink.admin.common.enums.UserErrorCodeEnum.USER_EXIST;
import static com.nageoffer.shortlink.admin.common.enums.UserErrorCodeEnum.USER_NAME_EXIST;
import static com.nageoffer.shortlink.admin.common.enums.UserErrorCodeEnum.USER_SAVE_ERROR;

/**
 * 用户接口实现层
 * 公众号：马丁玩编程，回复：加群，添加马哥微信（备注：link）获取项目资料
 */
@Service
@RequiredArgsConstructor
public class UserServiceImpl extends ServiceImpl<UserMapper, UserDO> implements UserService {

	private final RBloomFilter<String> userRegisterCachePenetrationBloomFilter;
	private final RedissonClient redissonClient;
	private final StringRedisTemplate stringRedisTemplate;
	private final GroupService groupService;

	@Override
	public UserRespDTO getUserByUsername(String username) {
		LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
				.eq(UserDO::getUsername, username);
		UserDO userDO = baseMapper.selectOne(queryWrapper);
		if (userDO == null) {
			throw new ClientException(UserErrorCodeEnum.USER_NULL);
		}
		UserRespDTO result = new UserRespDTO();
		BeanUtils.copyProperties(userDO, result);
		return result;
	}

	@Override
	public Boolean hasUsername(String username) {
		return !userRegisterCachePenetrationBloomFilter.contains(username);
	}

	@Override
	public void register(UserRegisterReqDTO requestParam) {
		if (!hasUsername(requestParam.getUsername())) {
			throw new ClientException(USER_NAME_EXIST);
		}
		RLock lock = redissonClient.getLock(LOCK_USER_REGISTER_KEY + requestParam.getUsername());
		try {
			if (lock.tryLock()) {
				try {
					int inserted = baseMapper.insert(BeanUtil.toBean(requestParam, UserDO.class));
					if (inserted < 1) {
						throw new ClientException(USER_SAVE_ERROR);
					}
				} catch (DuplicateKeyException ex) {
					throw new ClientException(USER_EXIST);
				}
				userRegisterCachePenetrationBloomFilter.add(requestParam.getUsername());
				groupService.saveGroup(requestParam.getUsername(), "默认分组");
				return;
			}
			throw new ClientException(USER_NAME_EXIST);
		} finally {
			lock.unlock();
		}
	}

	@Override
	public void update(UserUpdateReqDTO requestParam) {
		// TODO 验证当前用户名是否为登录用户
		LambdaUpdateWrapper<UserDO> updateWrapper = Wrappers.lambdaUpdate(UserDO.class)
				.eq(UserDO::getUsername, requestParam.getUsername());
		baseMapper.update(BeanUtil.toBean(requestParam, UserDO.class), updateWrapper);
	}

	@Override
	public UserLoginRespDTO login(UserLoginReqDTO requestParam) {
		LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
				.eq(UserDO::getUsername, requestParam.getUsername())
				.eq(UserDO::getPassword, requestParam.getPassword())
				.eq(UserDO::getDelFlag, 0);
		UserDO userDO = baseMapper.selectOne(queryWrapper);
		if (userDO == null) {
			throw new ClientException("用户不存在");
		}
		Map<Object ,Object> hasLoginMap = stringRedisTemplate.opsForHash().entries("login_" + requestParam.getUsername());
		if (CollUtil.isNotEmpty(hasLoginMap)) {
			String token = hasLoginMap.keySet().stream()
					.findFirst()
					.map(Object::toString)
					.orElseThrow(() -> new ClientException("用户登录错误"));
			return new UserLoginRespDTO(token);
		}
		/**
		 * Hash
		 * Key：login_用户名
		 * Value：
		 *  Key：token标识
		 *  Val：JSON 字符串（用户信息）
		 */
		String uuid = UUID.randomUUID().toString();
		stringRedisTemplate.opsForHash().put("login_" + requestParam.getUsername(), uuid, JSON.toJSONString(userDO));
		stringRedisTemplate.expire("login_" + requestParam.getUsername(), 30L, TimeUnit.MINUTES);
		return new UserLoginRespDTO(uuid);
	}

	@Override
	public Boolean checkLogin(String username, String token) {
		return stringRedisTemplate.opsForHash().get("login_" + username, token) != null;
	}

	@Override
	public void logout(String username, String token) {
		if (checkLogin(username, token)) {
			stringRedisTemplate.delete("login_" + username);
			return;
		}
		throw new ClientException("用户Token不存在或用户未登录");
	}
}
